<template>
  <div>
    <!-- 商品参数用于显示商品的固定的特征信息 分为动态参数和静态属性 动态参数可以选择  静态属性指的是商品固定的参数-->
    <el-card>
      <!-- 警告 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品的分类 -->
      <el-row>
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品的级联选择框 -->
          <el-cascader
            v-model="selected"
            expand-trigger="hover"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- 页签 -->
      <el-tabs v-model="activeName" @tab-click="handletableClick">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            :disabled="isBtn"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  class="tag"
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"> </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="infor"
                  @click="showEditDialog(scope.row)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  @click="removeParams(scope.row)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板  -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            :disabled="isBtn"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  class="tag"
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"> </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="infor"
                  @click="showEditDialog(scope.row)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  @click="removeParams(scope.row)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="Edit">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import {
  getParams,
  getParamsList,
  addParamsList,
  Editparams,
  deleParams,
  TagList,
} from "@/api/user";
import { Message, MessageBox } from "element-ui";
export default {
  data() {
    return {
      catelist: [],
      //级联选择框配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择框双向绑定到的数组
      selected: [],

      //被激活页签的名称
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态参数的数据
      onlyTableData: [],
      //控制添加对话框的显示隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      //修改的弹框
      editDialogVisible: false,
      //修改的表单对象
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //点击按钮，修改参数
    async Edit() {
      console.log(this.cateId, this.editForm);
      const data = await Editparams(this.cateId, {
        attr_id: this.editForm.attr_id,
        attr_sel: this.editForm.attr_sel,
        attr_name: this.editForm.attr_name,
      });
      // console.log(data);
      this.editDialogVisible = false;
      this.getParamsData();
      Message.success("修改参数成功");
    },
    //点击按钮,展示修改的对话框,数据回流
    showEditDialog(row) {
      this.editDialogVisible = true;
      this.editForm = row;
    },
    //重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮，添加参数
    async addParams() {
      try {
        this.$refs.addFormRef.validate();
        const data = await addParamsList(this.cateId, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        });
        console.log(data);
        this.getParamsData();
        Message.success("添加参数成功");
      } catch (error) {}
      this.addDialogVisible = false;
    },
    //tab页签点击事件的处理函数
    handletableClick() {
      this.getParamsData();
    },
    // 级联选择框选中变化，会触发这个函数
    async handleChange() {
      this.getParamsData();
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selected.length !== 3) {
        this.selected = [];
        return;
      }
      //证明选中的是三级分类
      console.log(this.selected);
      //根据所选分类的id，和当前所处的面板，获取对应的参数
      const data = await getParamsList(this.cateId, this.activeName);
      data.forEach((item) => {
        //先对attr_vales数组进行判断，如果不为空直接进行split分割，如果为空的字符串就返回空数组
        item.attr_vals = item.attr_vals ? item.attr_vals.trim().split(" ") : [];
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //控制文本框输入的值
        item.inputValue = "";
      });
      if (this.activeName == "many") {
        this.manyTableData = data;
      } else {
        this.onlyTableData = data;
      }
    },
    //获取所有商品分类列表
    async getCateList() {
      try {
        const data = await getParams();
        this.catelist = data;
        // console.log(this.catelist);
      } catch (error) {}
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    //根据id删除对应的参数项
    removeParams(row) {
      console.log(row);
      MessageBox.confirm("此操作将永久删除该参数", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(async () => {
          await deleParams(row.cat_id, row.attr_id);
          this.getParamsData();
          Message({
            type: "success",
            message: "删除成功!",
          });
        })
        .catch(() => {
          Message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
    //文本框失去焦点，或enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      //如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      //需要发起请求,保存这次操作
      this.saveAttrVals(row);
    },
    //点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      //文本框自动获取焦点
      //$nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码

      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的参数
    async handClose(i, row) {
      row.attr_vals.splice(i, 1);
      //需要发起请求,保存这次操作
      this.saveAttrVals(row);
    },
    //对attr_vals的操作，保存到数据库
    async saveAttrVals(row) {
      const data = await TagList(this.cateId, row.attr_id, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(" "),
      });
      console.log(data);
      Message.success("修改参数项成功");
    },
  },
  computed: {
    //如果按钮需要被禁用，则返回true,否则返回false
    isBtn() {
      if (this.selected.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selected.length === 3) {
        return this.selected[2];
      }
      return null;
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style scoped >
.el-row {
  margin: 20px 0;
}
.tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
